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Product Warranties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Product Warranties    
Warranty liability, beginning of year $ 96 $ 257
Accruals   10
Payments (10)  
Adjustments and other $ (86) (171)
Warranty liability, end of year   $ 96